Boiler feed trap



March 26, 1935.

H. E. K. Pol-u.

BOILER FEED TRAP Filed oct. s1, 1930 wens-s LINE `PatentedvffMarrrz, 1935 v 1,996,626 BoILEn FEED TRAP y Hans E K. Pohl,l River Forest,lIlll. assignor to Crane Co., Chicago,` Ill. a corporation v of Illinois Application `October 31, 1930, Serialy No.f 492,461

` enlands. (criar-103) o This-inventionrelates to systems for delivering fluids into receptacles under pressure and to such a system that `isparticul arly well adapted tofeeding Water to a boiler. -It isan objCCtof this *invention .to provide 'a system particularly suited asl a boiler feed' system. which is positive inf' action, simple in 'construction and readily accessiblefor adjustment and repairlf -It isv also an objectof this invention to elimi-y nate all unnecessary apparatus and combine the required apparatus in such away as to provide a compactpositive feeding system, Vthe essential parts of which may bel located at an accessible point 'vabout'the boiler being supplied thereby.

In Ivievv'of .its applicability to a'boiler feed Water V'supply the invention will bel described Vin this form. l l 1 In accordance with this invention the iluidis fedv into a reservoirsuch as a tilting trap `Which has in;Y conjunction therewith 'or under'control thereof, a sufficient number of valves 4to, permit thefeeding of the fluid into thetrap and from the trap into an auxiliary tanl; and from vthel Atank into the boiler in certainicycles Without the use of auxiliary traps or otherfeeding devices.`

By this invention all the Working parts are actuated by the same mechanism and thereforemay be made visible and accessible. i I

The trap is preferably arranged to receive water from any suitable source and to discharge thewater by the action of vthe-steam pressure of`r the boiler being fed, intoan auxiliarytank froml which the Water may be drained into the boiler by gravity. The trap is arranged tocontrolall ther required valves and particularly those` which will permit simultaneous filling of the trap' and transfer of Waterfrom the tank tothe boiler.

v"A better understanding of this inventionv will bevhad from the following description 'given in connection with the drawing in which:

' Fig. lis a schematic diagram illustrating the boiler feed system constructed and connected in accordance with thisinvention.

Fig.` 2 is a perspective rof the trap ciated valves-controlled thereby.l

. Referring more particularly to the drawing,

the boiler which is to be supplied with feed Water by a systernfinvolving this invention is indicated diagrammatically and is designated by the reference character k1. Feed yWatery from any 'suitable sourceof supply (notshown) i is connected to lpipe 2 from which it passes through ccntrol valve 3, check`valve4, pipe 6 and trunnion-`7`, into a "tilting trap 8 under certainconditions Y The-tilting` trap may be placed at any desired* and assolevel and is preferably placed in thek mostacces-v fi sible position regardless of the water level inthe f boiler. o yl steam is also admitted reihey tiltingk trans' under certain conditions through a pipe 9,"valve by trap 8, through a lever system 14ga second valve 16, is also operated.V by the trap.y through Va lever system 17. vThe latter valve controlsffa vent line 18 from the trap.

The trap discharges its Waterr afterzacertain A* level therein is reachedback throughl trunnions 1 into pipe 6 through check valvelQ and into pipe 2l. yPipe 22 of vrelatively larger f diarneterA 5 e y1l,"pipe`1 2, and trunnion.` The 110W of'stearn being controlled by a valve 13 which is actuated than pipe 21, connects pipe 21 Withan auxiliary tenfeet above the water line ofthe boiler. j( l The auxiliary tank 23 is vented to thefa'tmos-f phere during the Aperiods'when water is being transferred from trap 8 ,thereto throughfa' pipe gravity lfeed tank 23 disposed kpreferd'my'sixto` o 24 which connects toa valve 26v operated. by. t;ra,p

Sthrough a lever system 2.7. the valve dischargy inginto the atmospherethrough apipe l2 8.

Tank 23 'is alsosubjecte'dto the steamk.pres-y sure of the boiler being filled at certain periods] through a pipe 29,` check valve l31 and pipe4 32.y

Pipe 29 connects to a steam pipe 33x`which j onsj` pipe 9'and is connected to the boiler through a valve 34`and pipe 36. 'I'he ovv through pipes 29 and'33 is lcontrolled bya valvew37 also voperated by trap 8 `through' a lever system 38.

The steamwsuppiy tothe trap yc, throughth l pipe 9 obviously need: not be ytakenfrcpm the boiler direct'but can'be taken lfrom any sourcev if desired,v but the pressure must be suiliciently.

high to lift the Water" the requiredheight,` de-vy f pending of course,` upon the stallation. From the foregoing it will be seen that vtrap 8"actuates'four valves whichk controlthe entry nature, eff the inf trol v'tliel` venting of trap" 8 and tank 23`.

of s'team'into'ftrap 8'and tank 23A and also: garnir."`

through/'riser 22, check valve 39,valve-40; and. pipe 41. vThe Water will W` from'tank 23into the boilerjby gravity when the' -pressuref'in the A lTank 23 dischargesl its Waterr into the tankl and boiler isuequalized through Ythefopeiaek tion offvalves 26 and 2'?v by 'trap 8. f

Theoperation of theforegoing system is as fo11dw s: f f

Feed Water from 'any suitable 4source' Iis @into aitiltingf.- trap 8 throughy pip e2,' valve 3,#3 check valve-4, pipe y6 and trunnionf'?. While be-iing filled the trapris in its upperpositioniin'- whichposition valveY 16 is open thus venting the trap to atmosphere. Valve 13 at the 'saine time is closed and prevents the'entry of steam into the Ttrap. Water may therefore lowv into trap l8 until the latter is tilted into lower position by the rweight ofthe water. The lowering of trap 8Vclo'ses .valve 16 and therefore vent 18 and opens valve 13 admitting steam under pressure from-thel boiler into the trap. `'I'he steam forces the water from the trap through pipe '6; checkl YValve 19, lpipe 21 and pipe 22 intojthe auxiliary tank 23. During this period tank 23. isvented 4 to the'atmosphere through pipe 24 and Ayalve 26, ythe latter being maintained open by the trap ywhen in its lowered position.V Atthe sameperiod, valve 37 is maintained vclosed.by'thetrap;

' yaivefse'an valve inandpipe 4 1. i

After the Water has been forced. out of trap 8 and into tank 23 the ,traplwill' resume. its.

raised position thereby closing valve 1?Y to-.shut

' thesactions .being s'imultaneous. .l Also the single i .-riser 22 serves both to conduct water from trap 3, to tank 2?,. a`nd at a Vdiierent period in the cycle off l "ei'ations-'from tank `2 3 wtoboiler 1.

Ascanhe seen, particularly from Fig. 2, appli:`

cants trap is constructed vto independently operatevfourfdifferent valves -eachof which servesy a particular functionand each being operated-gin a certain timed relation Atothe other andy all -of y which 1in combination? make it `possible l:for the operation of applicants system. YThe fourvalves` losing` actually mechanically Voperated from the trap 'are y.positioned.'adjacent the trap preferably in fcloseproximity. thereto. `vDue tothe fact that allof'thcontrol valves for .thesystem-are operated from thefsingle Atraporfviirst reservoirinthe system. thermay all be lplaced at d; convenient 'GhC'bOilerfl The onlypartof the'systexnwhich necessarily need be placed atk anincon'venient place is the auxiliarytank 234 which requires no attentionwhatever. i. i y VIt isobviousy that the trap18 neednot` necessarily beldispfosedkbelow Vthe water-:level ofthe boiler-but may be placed above the water line if above thewater level.

Thel importance of haying for pipes and controls for-the `steam supply and there be aconvenient accessible position available.v

vent toy the auxiliary tank to insure p ositive,.ini`

' mediate; and silent operation may be further ex-l plainedbyassuming certain operating conditions. For."'exaln'ipla letoit Ybevasfsumed that acharge' of water has been` delivered-.totank 23,'anld the trap has'returned to lling position. A certain elapse 'l vff'tiine :is required to establish-*equalization'of pressures be,tweentank .23.L and theboiler especially when first starting the. system and-the Water` and f system are cold Yand the latter-"contains con:

densate. Equalization `must occurbefore the` waterl in tank 2 3 canflow)intothelrbpiler 1 .byv gravity, Duringftheperiod. 0f equalization which' i is longer when: the system isicolldAv trap. ,8"` may, again off steam from trap 8, opening valve 16 to rventr accessible point regardless of 'thegwaterjleveljin' dependent lines be lled with water and'tilt into discharging position a second time, delivering another charge to tank 23. Thejfirst charge stillbeing present in,

tank 23 must be displaced by the secondcharge and will vspill over through vent liner 24. yIf it were not Afor thisindependent vent' line the condensate and excess water would haveto return through steam line 29, with the consequence that when the trap returned to .iilllng position vthe steam line 29 would be water loggedand the entire r system wouldbe blocked until the stear'ngline29 wasl cleared. It is, therefore, important that independent steam and vent lines `be provided in order to maintain a dry steam line at all times.

As a further assurance of dry steam the line 32 isl preferably installedat a higher levelthan vthe Vent line24 and-provided with a check valve 31...

.It is obvious that' many changes Vmay be made in the piping and structural details without departing from the spirit and scope of this-:inventionasdefined in` the claims; appended heretog-fy v l I claim:

1. In a feed water supply system,.a tilting.-trapy f a water supply pipethereto, a ventllline having a valve'therein andoconnected"tothejtrap Vfor ventingthe sanie,'.a steam line'having therein connected thereto :for .adxnittin under pressure into said .trap,operative connec-y tions vbetween ksaidvtrap ands'aid valveswherelby i said Valves are controlled by the positionrof saidv trap, an auxiliary tank, a water connection f therefrom to said trapgl a vent line'yfh'aving la v valve therein.V and c :olrnaectedL to said' tankffor venting the same, independent steainline hav-r l ing d valve therein-and Ciideidi.Sidialiky for admittingsteam under v`pressure into'g'said4 tank,Y operative connections. between said latter two valves and said trap whereby saidlattertwo valves are controlled b y the position of said trap, and awater discharge pipe from said Vtank.v`

2- .In @i feed, Water Supply SYStem a. tilting trap,

a water supply pipe thereto, ar vent line thereto havingk a valvetherein secured tosaid trap anda steam `line having avalve therein securedy to said trap ,for admitting steamlunder pressureA into said trap, operative connections between said.

trap and saidval'ves whereby said valves ,are con.- trolled by the DQSiton4 of saidtrap, an auxiliary tank, av water connectionrtherefrom tolsaid trap,

a ventline havingl a valvetherein secured -to said trap and independent .0f the interior. theredffand connected to said tankl for` venting the same, an

independent Siamlinepfhaving a. .valvev therein' n secured tosaidtrap and independent of the, in-` terior thereof' and connected to said' `tankgwforadmitting vSteam *under pressure vinto' said tank,-

operative connections from saidlatter.. two valves,

i0` Said. trap whereby said latter. two valves are Controlled by thev position.y ofvr said trap, and d.-y

Water discharge pipeqiromsaid tank, said 'water discharge pipe including` in Lpart .said water com nections.: 1 f f 3. In. a `boiler feed Y water ,f supply system,the

combination with a' stearng'boiler, offa; tilting trap, an auxiliary at a higherelevationthan the water level of said boiler;;,connectio ns having non-return check valves for supplying' water lto said trap andforfeed ofxwater from said trap yto saidgtank and. from ksaid tank;v tovv saidboiler,

valve means and separate connections controlled th'erebydior alternately' venting. said trap` anda admitting'j steam from said boiler tov said. trap,v operative Vconnections between, said. valve means andtrap whereby.saidvalveLmeans are. controlled-` by. 12h52 Vposition' ofV said trap.. other .valve mea-ns y combination with a steam boiler, of a'tilting trap,

an auxiliary tank ata higher elevationthan the water level of said boiler, connections having.

non-return check valves `for' supplying water to said trap and for feed of water from said trap to said tank and from said tank to said boiler, valve means and separate connections controlled thereby for alternatelyv venting andadmitting steam to said trap, operative connections between said valve means and trap whereby said valve means .are controlled by the position of said trap, other valve means and separate connections controlled thereby rfor alternately venting and admitting steam'to said tank, and operative connections n between .said last mentioned valve` means and the trap whereby the latter valve means are controlled by the positionof the-trap,Said last mentioned connections operating said last mentioned valve means to vent the tank, during admission.

of-steam to said trap and to admit steam to the tank 'during the venting of the trap,y said trap `and all of said valve means and operating connections being disassociated iliary tank, f

5. In a boiler feed water system, the combination with a steamy boiler, of a tilting trap, an auxiliary tank at a Ahigher elevation than the water level of said boilerfa Water supply pipe having anon-return check valve connected with said trap, a pipe having a non-return check valve connecting said first mentioned pipewith said auxiliary tank, a pipe having a non-return check yvalve connecting said` second mentionedV pipe with `the water space of said boiler, theconnectionbetween the second and third pipes being between the second mentioned check valve;y andv .the auxiliary tank, valve means and yseparate connections` controlled Athereby Afor alternately p venting and admitting` steamito said' trap', lop-A' erative connections' betweenfsai'd valve means and trap whereby said valvefmeans are controlled by the position Aof said trap.other` valvemeans and separate connections controlledl thereby/for alternately venting and admittingsteamf to said tank, and operative connections between said lastmentioned valve means.y and the trap whereby the latter valve means are controlled by. thev position of the trap, said last mentioned connections operating said last mentioned'valve lmeans to-vent the-tankduring admission-of steam to said trap andmto admit steam to the'tank ,during the venting of the trap. f e' V 6'. In a boiler feed water system, the combinartion, with a steam huilen-of a tilting trap, an

auxiliary `tank at a higher elevation .than the water level of said boiler, awater supplyk pipe "having a non-return check valve connected with said trap, a pipehaving a non-return check valve connecting said first Vmentioned y pipe with said auxiliary tank, a pipe having a non-return checky l valve connecting said second mentioned pipe with Vthe water space of said boiler, the'connectionA between thesecond and third pipes being between the secondjmentioned check valve and the auxiliary tank, said trap adapted to tilt 4'downwardly in response to a predetermined lling and to tilt upwardly in response to a'predetermined emptying/independent` ventl connections for said trap and said auxiliary tank, independent connections forV supplying steam from said boiler to said trap and auxiliary tank, and automaticvalve mechanism 'associated with said tilting trap and operativef to one position by the downward tilting of the trap and to another position bythe upward tilting of the trap, said valve means conl trolling the respective vent and steam connec- A tions for admitting steam to the 'trap and venting the auxiliary tank in said first mentioned position andfor venting the trap and admitting v steam to the auxiliary tank inv said second mentioned position.

`HANS E. Krom.; t e 

